Ver4 is the stupidest firmware!

My Cloud OS 3 Personal & Network Attached Storage My Cloud
2

You need to refer to what I posted last week.  It may help you understand why you weren’t able to install 3rd party software on the My Cloud.

http://community.wd.com/t5/WD-My-Cloud/New-Release-WD-My-Cloud-Firmware-Release-4-00-00-607-7-9-14/m-p/761150#U761150